Datasheet

3
LTC1850/LTC1851
18501f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Input Range (Note 9) 4.75V ≤ V
DD
≤ 5.25V
Unipolar, Gain = 1 (PGA = 1) 0 – REFCOMP V
Unipolar, Gain = 2 (PGA = 0) 0 – REFCOMP/2 V
Bipolar, Gain = 1 (PGA = 1) ±REFCOMP/2 V
Bipolar, Gain = 2 (PGA = 0) ±REFCOMP/4 V
I
IN
Analog Input Leakage Current V
IN
> 0V < V
DD
, All Channels ● ±1 µA
C
IN
Analog Input Capacitance Between Conversions (Gain = 1) 15 pF
Between Conversions (Gain = 2) 25 pF
During Conversions 5 pF
t
ACQ
Sample-and-Hold Acquisition Time ● 50 150 ns
t
S(MUX)
Multiplexer Settling Time (Includes t
ACQ
) ● 50 150 ns
t
AP
Sample-and-Hold Aperture Delay Time –0.5 ns
t
jitter
Sample-and-Hold Aperture Delay Time Jitter 2 ps
RMS
CMRR Analog Input Common Mode Rejection Ratio 0V < (A
IN
–
= A
IN
+
) < 5V 60 dB
The ● denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
A ALOG I PUT
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LTC1850 LTC1851
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Resolution (No Missing Codes) ● 10 12 Bits
Integral Linearity Error (Note 7) ● ±0.25 ±0.5 ±0.35 ±1LSB
Differential Linearity Error ● ±0.25 ±0.5 ±0.25 ±1LSB
Offset Error (Bipolar and Unipolar) (Note 8)
Gain = 1 (PGA = 1) REFCOMP ≥ 2V ±2 ±5LSB
Gain = 1 (PGA = 1) REFCOMP ≥ 2V ● ±0.5 ±2 ±1 ±7LSB
Gain = 2 (PGA = 0)
● ±1 ±4 ±2 ±10 LSB
Offset Error Match ±0.5 ±1LSB
Unipolar Gain Error With External 4.096V Reference
Gain = 1 (PGA = 1) Applied to REFCOMP (Note 12) ±2 ±6LSB
Gain = 2 (PGA = 0) ±4 ±10 LSB
Unipolar Gain Error Match ±0.5 ±1LSB
Bipolar Gain Error With External 4.096V Reference
Gain = 1 (PGA = 1) Applied to REFCOMP (Note 12) ±2 ±6LSB
Gain = 2 (PGA = 0) ±4 ±10 LSB
Bipolar Gain Error Match ±0.5 ±1LSB
Full-Scale Error Temperature Coefficient 15 15 ppm/°C
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 5, 6)
CO VERTER CHARACTERISTICS
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